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Quiz12spring2004 - ENSC 3313 Spring 2004 Quiz 12 ANSWERS...

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ENSC 3313, Spring 2004 Quiz 12 ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. You wish to construct a temperature sensor (i.e., a thermistor) from an intrinsic semiconductor such that you get a 10% increase in conductivity between 100 o C and 101 o C. What should the band gap be in eV? Note: k B =8.61 × 10 -5 eV/K recall: T k E B g Ce T 2 / ) ( = σ , thus I can write eV k E k E C C B G B G o o 29 . 2 373 1 374 1 ) 1 . 1 ln( 2 373 1 374 1 2 exp 10 . 1 ) 100 ( ) 101 ( = = = = σ σ 2. Explain the meaning of p type and n type semiconductors. p type semiconductors are those that have been doped with acceptors that have energy states close to the valence band. Thus, electrons from the valence band can occupy these states and create holes, which are the majority charge carriers and are p ositive. n type semiconductors are those that have been doped with donors that have energy states close to the conduction band.
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